use tauri::State;
use serde::{Deserialize, Serialize};
use tracing::{info, error, debug};

use crate::database::DatabaseManager;
use crate::error::{AppError, Result as AppResult};

#[derive(Debug, Serialize, Deserialize)]
pub struct DashboardStats {
    pub devices: serde_json::Value,
    pub accounts: serde_json::Value,
    pub tasks: serde_json::Value,
}

#[derive(Debug, Serialize, Deserialize)]
pub struct AnalyticsQuery {
    pub account_id: Option<String>,
    pub platform: Option<String>,
    pub date_range: Option<(String, String)>,
    pub metric_types: Option<Vec<String>>,
}

#[derive(Debug, Serialize, Deserialize)]
pub struct MetricData {
    pub date: String,
    pub value: f64,
    pub metric_type: String,
    pub platform: String,
}

/// 获取仪表板统计数据
#[tauri::command]
pub async fn get_dashboard_stats(
    db: State<'_, DatabaseManager>
) -> Result<DashboardStats, String> {
    info!("Fetching dashboard statistics");
    
    // 并行获取各种统计数据
    let (device_stats, account_stats, task_stats) = tokio::try_join!(
        db.get_device_stats(),
        db.get_account_stats(),
        db.get_task_stats()
    ).map_err(|e: crate::error::AppError| {
        error!("Failed to fetch dashboard stats: {}", e);
        format!("Failed to fetch dashboard stats: {}", e)
    })?;
    
    let dashboard_stats = DashboardStats {
        devices: device_stats,
        accounts: account_stats,
        tasks: task_stats,
    };
    
    debug!("Dashboard stats fetched successfully");
    Ok(dashboard_stats)
}

/// 获取性能指标
#[tauri::command]
pub async fn get_performance_metrics(
    time_range: String, // "24h", "7d", "30d"
    _db: State<'_, DatabaseManager>
) -> Result<serde_json::Value, String> {
    info!("Fetching performance metrics for: {}", time_range);
    
    // TODO: 实现性能指标查询
    // 包括任务执行时间、成功率、设备利用率等
    
    let metrics = serde_json::json!({
        "task_execution_time": {
            "avg": 120.5,
            "min": 30.2,
            "max": 300.8,
            "unit": "seconds"
        },
        "success_rate": {
            "overall": 95.2,
            "by_platform": {
                "tiktok": 96.1,
                "instagram": 94.8,
                "facebook": 95.5
            }
        },
        "device_utilization": {
            "avg": 75.3,
            "peak": 95.0,
            "unit": "percentage"
        }
    });
    
    Ok(metrics)
}

/// 获取账号分析数据
#[tauri::command]
pub async fn get_account_analytics(
    account_id: String,
    date_range: Option<(String, String)>,
    _db: State<'_, DatabaseManager>
) -> Result<serde_json::Value, String> {
    info!("Fetching analytics for account: {}", account_id);
    
    // TODO: 实现账号分析数据查询
    // 包括粉丝增长、互动率、内容表现等
    
    let analytics = serde_json::json!({
        "follower_growth": [
            {"date": "2024-12-20", "count": 1000},
            {"date": "2024-12-21", "count": 1025},
            {"date": "2024-12-22", "count": 1050}
        ],
        "engagement_rate": [
            {"date": "2024-12-20", "rate": 3.2},
            {"date": "2024-12-21", "rate": 3.5},
            {"date": "2024-12-22", "rate": 3.8}
        ],
        "post_performance": {
            "avg_likes": 150.5,
            "avg_comments": 25.3,
            "avg_shares": 12.1
        }
    });
    
    Ok(analytics)
}

/// 获取平台趋势数据
#[tauri::command]
pub async fn get_platform_trends(
    platform: String,
    metric_type: String,
    time_range: String,
    _db: State<'_, DatabaseManager>
) -> Result<Vec<MetricData>, String> {
    info!("Fetching trends for platform {}, metric: {}", platform, metric_type);
    
    // TODO: 实现平台趋势数据查询
    
    let trends = vec![
        MetricData {
            date: "2024-12-20".to_string(),
            value: 100.0,
            metric_type: metric_type.clone(),
            platform: platform.clone(),
        },
        MetricData {
            date: "2024-12-21".to_string(),
            value: 105.2,
            metric_type: metric_type.clone(),
            platform: platform.clone(),
        },
        MetricData {
            date: "2024-12-22".to_string(),
            value: 108.7,
            metric_type: metric_type.clone(),
            platform: platform.clone(),
        }
    ];
    
    Ok(trends)
}

/// 生成报表
#[tauri::command]
pub async fn generate_report(
    report_type: String,
    _filters: serde_json::Value,
    format: String,
    _db: State<'_, DatabaseManager>
) -> Result<String, String> {
    info!("Generating {} report in {} format", report_type, format);
    
    // TODO: 实现报表生成逻辑
    // 支持生成设备使用报表、账号增长报表、任务执行报表等
    
    let report_file = format!("report_{}_{}.{}", 
        report_type, 
        chrono::Utc::now().format("%Y%m%d_%H%M%S"),
        format
    );
    
    info!("Report generated: {}", report_file);
    Ok(report_file)
}

/// 获取实时统计
#[tauri::command]
pub async fn get_realtime_stats(
    _db: State<'_, DatabaseManager>
) -> Result<serde_json::Value, String> {
    debug!("Fetching real-time statistics");
    
    // TODO: 实现实时统计数据
    // 包括当前运行任务数、在线设备数、活跃账号数等
    
    let realtime_stats = serde_json::json!({
        "timestamp": chrono::Utc::now().to_rfc3339(),
        "active_tasks": 3,
        "online_devices": 2,
        "active_accounts": 8,
        "system_load": 45.6,
        "memory_usage": 67.2,
        "network_status": "good"
    });
    
    Ok(realtime_stats)
}

/// 获取历史数据对比
#[tauri::command]
pub async fn get_historical_comparison(
    metric_type: String,
    current_period: (String, String),
    comparison_period: (String, String),
    _db: State<'_, DatabaseManager>
) -> Result<serde_json::Value, String> {
    info!("Comparing historical data for metric: {}", metric_type);
    
    // TODO: 实现历史数据对比
    
    let comparison = serde_json::json!({
        "current_period": {
            "start": current_period.0,
            "end": current_period.1,
            "value": 150.5,
            "change": "+12.3%"
        },
        "comparison_period": {
            "start": comparison_period.0,
            "end": comparison_period.1,
            "value": 134.2,
            "change": "+5.8%"
        },
        "improvement": "+16.3%"
    });
    
    Ok(comparison)
}

/// 预测分析
#[tauri::command]
pub async fn get_predictions(
    _account_id: Option<String>,
    metric_type: String,
    prediction_days: u32,
    _db: State<'_, DatabaseManager>
) -> Result<serde_json::Value, String> {
    info!("Generating predictions for {} days", prediction_days);
    
    // TODO: 实现基于机器学习的预测分析
    // 预测粉丝增长、互动趋势等
    
    let predictions = serde_json::json!({
        "metric_type": metric_type,
        "prediction_period": prediction_days,
        "confidence": 0.85,
        "predictions": [
            {"date": "2024-12-29", "predicted_value": 1200, "confidence": 0.9},
            {"date": "2024-12-30", "predicted_value": 1235, "confidence": 0.87},
            {"date": "2024-12-31", "predicted_value": 1270, "confidence": 0.85}
        ]
    });
    
    Ok(predictions)
}